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Cantenna:
A `cantenna` is a directional waveguide antenna for long-range Wi-Fi used to increase the range of (or snoop on) a wireless network. Originally built using a Pringles potato chip can, a cantenna can be constructed quickly, easily, and inexpensively using readily obtained materials:

Tac·ti·cal
adjective /ˈtaktikəl/

Of, relating to, or constituting actions carefully planned to gain a specific military end

– as a tactical officer in the field he had no equal

(of bombing or weapons) Done or for use in immediate support of military or naval operations

(of a person or their actions) Showing adroit planning; aiming at an end beyond the immediate action

[Something that is black in color and often adorned with picatinny rails]